Question
Difference between a number and its square root is 42.
Find the number.Solution
Let the number be 'x'.So, x - 42 = √xOn, squaring both sides, we have;(x - 42) 2 = (√x) 2Or, x2 + 1764 - 84x = xOr, x2 - 85x + 1764 = 0Or, x2 - 36x - 49x + 1764 = 0Or, x(x - 36) - 49(x - 36) = 0Or, (x - 49) (x - 36) = 0So, x = 49 or x = 36We can see that 'x' = 36 will not satisfy the equation, so x = 49
√(?) ² = √7396 - √6889
65% of ? = 50 + 20 × 4
Evaluate:
7.5 + 12 ÷ (4 × 1.5) − 2.4
280 – 70 × 14 ÷ 5 = ? – 21 of 3
What will come in place of (?) question mark in the following expression.
(123 ÷ 62) × 15 - 120 = ?
√729 × 5 + 270 - 3 ÷ ∛27 + 4 × ? = 484
654.056 + 28.9015 × 44.851 – 43.129 =?
If 1.123 × 3.211 = 3.122 + ______________, then the number in blank space is
What will come in the place of question mark (?) in the given expression?Â
(240% of 175 ÷ √16) X 6 + 80% of 400 = ?3 + 179 + 42
? ÷ 62 × 12 = 264
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