Question
Multiply: $(2x + 3y)(2x - 3y)$
✓
Answer
$(2x + 3y)(2x - 3y)$
$\Rightarrow 2x (2x - 3y) + 3y(2x - 3y)$
$\Rightarrow 2x \times 2x - 2x \times 3y + 3y \times 2x - 3y \times 3y$
$\Rightarrow 4x^2 - 6xy + 6xy - 9y^2$
$\Rightarrow 4x^2 - 0 - 9y^2$
$\Rightarrow 4x^2 - 9y^2$
$\Rightarrow 2x (2x - 3y) + 3y(2x - 3y)$
$\Rightarrow 2x \times 2x - 2x \times 3y + 3y \times 2x - 3y \times 3y$
$\Rightarrow 4x^2 - 6xy + 6xy - 9y^2$
$\Rightarrow 4x^2 - 0 - 9y^2$
$\Rightarrow 4x^2 - 9y^2$
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