Factorise the following
A^2-5a-36
Answers
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➡ {a}^2 + {5a} - {36} a
2
+5a−36
= {a}^2 + {(9-4)}a - {36} a
2
+(9−4)a−36
= {a}^2 + {9a} - {4a} - {36} a
2
+9a−4a−36
= {a} ( a + 9 ) - {4} ( a + 9 ) a(a+9)−4(a+9)
= {(a - 4)} {(a + 9)} (a−4)(a+9) ✔✔
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Answer:
(a+4)(a-9)
Step-by-step explanation: Rough work
=a^2 -5a -36 1*36=36
=a^2 +4a-9a -36 2*16=36
=a(a+4)-9(a+4) 3*12=36
=(a+4)(a-9) 4*9=36