Question

(5x+3)(5x-3) what is the answer if multiplied

Answer 1

`\sf25 {x}^(2) - 9`

Explanation:

We can use Foil method to find the answer for this expression.

(5x + 3) (5x - 3)

That is:

F --> First ---> (5x)(5x)

O --> Outside ---> (5x) (-3)

I --> Inside ---> (3)(5x)

L --> Last ---> (3) (-3)

And now we have to add those terms together while combining like terms.

`\sf(5x)(5x) + (5x)( - 3) + (3)(5x) + (3)( - 3) \\ \sf25 {x}^(2) - 15x + 15x - 9 \\ \sf25 {x}^(2) - 9`

Answer 2

25x^2 -9

Explanation:

(5x+3)(5x-3)

FOIL

first 5x*5x = 25x^2

outer 5x*-3 = -15x

inner 3*5x = 15x

last = 3*-3 = -9

Add them together 25x^2 -15x+15x -9

Combine terms 25x^2 -9