If ${(64)}^{2} - {(36)}^{2} = 20 x$ $x$ , then $x =$ ?

70

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120

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180

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140

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None of these

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Solution

The correct option is E $140$
$20 x$ $x = (64 + 36) (64 - 36) = 100 \times 28$
$\Rightarrow$ $x = \frac{100 \times 28}{20} = 140$

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If (64)2−(36)2=20x x, then x=?

The correct option is E 14020x x=(64+36)(64−36)=100×28⇒ x=100×2820=140

If ${(64)}^{2} - {(36)}^{2} = 20 x$ $x$ , then $x =$ ?

The correct option is E $140$
$20 x$ $x = (64 + 36) (64 - 36) = 100 \times 28$
$\Rightarrow$ $x = \frac{100 \times 28}{20} = 140$