Evaluate using identities 1. (91)^2
Answers
Answered by
1
Step-by-step explanation:
91×2=(1+90)(1+1)
=(1)square +1(90+1)+90×1
=1+1×91+1
=2×91
=182
Answered by
2
Answer:
91² = 8281
Step-by-step explanation:
(91)²
= (100-9)²
= 100²-2×100×9+9²
/* By algebraic identity:
(a-b)² = a² - 2ab + b² */
= 10000 - 1800 + 81
= 8200+81
= 8281
Therefore,
91² = 8281
•••♪
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