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Multiply:(a - 5) by (a + 4). |
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Answer» Answer ⋆ ༺═────────────────────────────═༻ We have a formula for this problem. \large{\tt{\green{Formula\implies (x+a)(x+b) = x^2+ (a+b)x+(ab)}}}Formula⟹(x+a)(x+b)=x 2 +(a+b)x+(ab) we have been given that x= a a=5 b=4 So by applying the formula Above-mentioned (a+5)(a+4)=a²+(5+4)a+(4 x 5) \implies⟹ \large\bold{\boxed{a^2 + 9a + 20}} a 2 +9a+20 ༺═─ (a - 5) (a + 4) = a(a + 4) - 5(a + 4) =a2 + 4a - 5a + 20 = a2 - a + 20 |
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