Question

Using (x+a)(x+b)=x2 + (a+ b)x+ab , Find 102x105

Answer 1

Answer:

102×105=(100+2)(100+5)

(x+a)(x+b)=x^2+(a+b)x+ab

(100+2)(100+5)=

• 100^2+(2+5)100+2×5
• 10000+(7)100+10
• 10000+700+10
• 10710

Answer 2

102×105

=> (100+2)(100+5)

Here x = 100, a = 2 and b = 5

(x+a)(x+b)=x2 + (a+ b)x+ab

(100+2)(100+5) = 100²+(2+5)100+2×5

=> 10000+700+10

=> 10,710

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