Question

What are the solutions of the equation (x+3)(x-3)=40

Answer 1

Answer:

(x+3)(x-3)=40

multiplying two equations we get, it is in the form of (a+b)(a-b)=a^2-b^2

(x^2-3^2)=

x^2-9=40

x^2=49

x=7

The soluction of given equation is 7

Hope this helps you

Answer 2

Answer:

QUESTION -

What are the solutions of the equation (x+3)(x-3)=40

METHOD TO DO -

As the question in equation form, 1st we need to solve first half by using formula than after solving the equation , we can get the value of x .

FORMULA USED -

a² - b² = ( a + b) ( a - b)

solution -

( x + 3) ( x - 3) = 40

using formula of a² -b²,

(x)² - ( 3)³ = 40

x² - 9 = 40

x² = 40 + 9

x²= 49

so, using root under to both sides,

√x² = √49

x= 7

Hence, the value of x is 7 answer