Question

1. Find the product:
(a) (x+5) (x + 4)​

Answer 1

Answer:

= x(x+4) + 5(x+4)

=

$x {}^{2} + 4x + 5x + 20$

=

$x {}^{2} + 9x + 20$

Answer 2

Answer:

using the identity :

${x}^{2} + x(a + b) + ab = (x + a)(x + b)$

${x}^{2} + x(5 + 4) + 5 \times 4$

${x}^{2} + 9x + 20$

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