Question

If (x+4) (x-4)=9 ,then the value of x is

Answer 1

mate your answer is here

Answer 2

Given,

(x+4) (x-4)=9

To find,

The value of x.

Solution,

The value of x will be ±5.

We came easily solve this problem by following the given steps.

According to the question,

(x+4) (x-4)=9

Solving this expression using the identity, (a+b) (a-b) = a²-b². In this case, we have a = x and b = 4.

[Note that we can also solve it by multiplying (x+4) into (x-4).]

(x+4) (x-4)=9

(x)²-(4)² = 9

x²-16 = 9

x² = 9+16

x² = 25

x = √25

x = ± 5

(More to know: we have major eight identities to solve the algebraic expressions.)

Hence, the value of x is ±5.