Question
(x + 4) 2 + (y – 1) 2 + (z +
2) 2 = 0, then find the value of 2x - 3y + z.Solution
If (x + 4) 2 + (y – 1) 2 + (z + 2) 2 = 0, then (x = - 4), (y = 1), and (z = - 2).
So,
- x + 4 = 0 → x = -4
- y - 1 = 0 → y = 1
- z + 2 = 0 → z = -2
Therefore, required value:
2(-4) - 3(1) + (-2) = -8 - 3 - 2 = -13
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
156.76 + 14.08² + ?³ = √625.12 * 26.87
What approximate value will come in place of question (?) in the following given expression? You are not expected to calculate the exact value.
...24.11 × 5.98 + 25.03 × 3.12 – 34.99 + 96.9 × 5.02 =?
[(√2024.85 ÷ 3.01) + (35.76 ÷ 11.92)]² × (3/4 of 39.99) = ?
14.99% of 7820 + 5535.25 ÷ 123.001 - ? = 84
{(440.89 ÷ 20.74) ÷ 2.88} × 48.65 = ? 3
15.63% of 174.99 + √? = 139.98% of 24.98
1120.04 – 450.18 + 319.98 ÷ 8.06 = ?
‘A’ and ‘B’ can build a wall in 8 days and 12 days, respectively. If ‘A’ started building the wall alone but after 4 days he was replaced by...
