Use the suitable identity to find the following product:
i) (x + 8)(x + 10) ii) (5 – y )(5 + y)
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Use the suitable identity to find the following product:
i) (x + 8)(x + 10) ii) (5 – y )(5 + y)
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Answer:
i) x²+18x+80
ii) 5²-y²
Step-by-step explanation:
i) (x+a)(x+b)= x²+(a+b)x+ab
(x+8)(x+10)=x²+(8+10)x+8×10
=x²+18x+80
ii) (x-y)(x+y)=(x²+y²)
(5-y)(5+y)=(5²-y²)