Question

Q) Find the product using the~ identity (x+a)(x+b)=x²+(a+b)x+ab
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(i) (x+7)(x+5)

(ii) (7x+2y)(7x+6y)

(iii) 98 × 97
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Answer 1

Step-by-step explanation:

(i) (x+7)(x+5)

x^2+(7+5)x+7×5

x^2+12x+35

(ii) (7x+2y)(7x+6y)

(7x)^2+(2y+6y)7x+2y×6y

49x^2+84xy+12y^2

(iii) 98 × 97

(100-2)(100-3)

(100)^2+[-2-3]100+(-2)(-3)

10000-500+6

9500+6

9506

Hope it's help u!!