Question

What is (x+3) (x-7)?

Answer 1

Answer:

We can use FOIL to solve this:

F - First

O - Outer

I - Inner

L - Last

$= (x \times x)+(x \times - 7)+(3 \times x)+(3 \times - 7)$

$= {x}^{2} + - 7x + 3x - 21$

$= {x}^{2} - 4x - 21$

Answer 2

Answer:

$x^2-4x-21$

Step-by-step explanation:

$\left(x+3\right)\left(x-7\right)$

Apply FOIL method:-

$\left(a+b\right)\left(c+d\right)=ac+ad+bc+bd$

$\left(x+3\right)\left(x-7\right)$

$xx+x\left(-7\right)+3x+3\left(-7\right)$

$=x^2-4x-21$

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