Question

By using a suitable algebraic identity, evaluate the following

i) 806^2

ii) 698 x 702

Answer 1

i) 806²

=(800+6)²

=640000+36+9600

=649636

ii)698×702

=(700-2)(700+2)

=700²-2²

=490000-4

=489996

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Answer 2

$\huge\underline\purple{\sf Answer}$

Evaluate the given forms.

$1.(806) {}^{2} \\ \\ = (800 + 6) {}^{2} \\ \\ = 640000 + 36 + 9600 \\ \\ = 649636.$

$2)\: 698 \times 702 \\ \\ = (700 - 2)(700 + 2) \\ \\ = 700 {}^{2} - 2 {}^{2} \\ \\ = 490000 - 4 \\ \\ = 489996$

$\huge\underline\pink{\sf Thank you }$