how to evaluate (72)^2- (68)^2
Answers
Answered by
31
Answer: 560
Step-by-step explanation:
(72)² - (68)²
We know,
a²-b² = (a-b) (a+b)
=> (72)²-(68)²
= (72-68) (72+68)
= (4) (140)
= 4 × 140
= 560
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Answered by
7
(70+2)^2 - (70 - 2)^2
=> (70+2)^2 = 4900 + 4 + 280 [by using formula (a+b)^2]
=>(70-2)^2 = 4900 +4-280[by using same identity ]
=4900+4+280 - ( 4900+4-280)
= 4900+4+280 - 4900 -4 +280
= 560 ✌✌
❤❤hope it's help you ❤❤
=> (70+2)^2 = 4900 + 4 + 280 [by using formula (a+b)^2]
=>(70-2)^2 = 4900 +4-280[by using same identity ]
=4900+4+280 - ( 4900+4-280)
= 4900+4+280 - 4900 -4 +280
= 560 ✌✌
❤❤hope it's help you ❤❤
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