Solve the quadratic equation $-x^2+7x-10=0$

Step-by-step Solution

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Final answer to the problem

$x=2,\:x=5$
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Step-by-step Solution

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1

Factor the trinomial by $-1$ for an easier handling

$-\left(x^2-7x+10\right)=0$
2

Factor the trinomial $-\left(x^2-7x+10\right)$ finding two numbers that multiply to form $10$ and added form $-7$

$\begin{matrix}\left(-2\right)\left(-5\right)=10\\ \left(-2\right)+\left(-5\right)=-7\end{matrix}$
3

Rewrite the polynomial as the product of two binomials consisting of the sum of the variable and the found values

$-\left(x^2-7x+10\right)=0$
4

Factor the trinomial $\left(x^2-7x+10\right)$ finding two numbers that multiply to form $10$ and added form $-7$

$\begin{matrix}\left(-2\right)\left(-5\right)=10\\ \left(-2\right)+\left(-5\right)=-7\end{matrix}$
5

Rewrite the polynomial as the product of two binomials consisting of the sum of the variable and the found values

$-\left(x-2\right)\left(x-5\right)=0$
6

Apply the formula: $-x=a$$\to x=-a$, where $a=0$ and $x=\left(x-2\right)\left(x-5\right)$

$\left(x-2\right)\left(x-5\right)=0$
7

Break the equation in $2$ factors and set each factor equal to zero, to obtain simpler equations

$x-2=0,\:x-5=0$
8

Solve the equation ($1$)

$x-2=0$
9

Apply the formula: $x+a=b$$\to x+a-a=b-a$, where $a=-2$, $b=0$, $x+a=b=x-2=0$ and $x+a=x-2$

$x-2+2=0+2$
10

Apply the formula: $x+a+c=b+f$$\to x=b-a$, where $a=-2$, $b=0$, $c=2$ and $f=2$

$x=2$
11

Solve the equation ($2$)

$x-5=0$
12

Apply the formula: $x+a=b$$\to x+a-a=b-a$, where $a=-5$, $b=0$, $x+a=b=x-5=0$ and $x+a=x-5$

$x-5+5=0+5$
13

Apply the formula: $x+a+c=b+f$$\to x=b-a$, where $a=-5$, $b=0$, $c=5$ and $f=5$

$x=5$
14

Combining all solutions, the $2$ solutions of the equation are

$x=2,\:x=5$

Final answer to the problem

$x=2,\:x=5$

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Function Plot

Plotting: $-x^2+7x-10$

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2
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5
6
7
8
9
0
a
b
c
d
f
g
m
n
u
v
w
x
y
z
.
(◻)
+
-
×
◻/◻
/
÷
2

e
π
ln
log
log
lim
d/dx
Dx
|◻|
θ
=
>
<
>=
<=
sin
cos
tan
cot
sec
csc

asin
acos
atan
acot
asec
acsc

sinh
cosh
tanh
coth
sech
csch

asinh
acosh
atanh
acoth
asech
acsch

How to improve your answer:

Main Topic: Equazioni quadratiche

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