Solve each equation. 5x2 - 55 = 90

x= ± sqrt(29)

Step-by-step explanation:

5x^2 - 55 = 90

Add 55 to each side

5x^2 - 55+55 = 90+55

5x^2 = 145

Divide each side by 5

5/5x^2 =145/5

x^2 = 29

Take the square root of each side

sqrt(x^2)= ± sqrt(29)

x= ± sqrt(29)

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0