Question
If  a 2 + b 2 + c
>2 = 40 & ab + bc + ca = 12 then a + b+ c = ?Solution
(a+b+c)2 = a2+b2+c2+ 2ab+2bc+2ca So (a+b+c) 2 = 40+2(12) or (a+b+c) 2 = 40 +24 so (a+b+c) 2 = 64 so (a+b+c)  = 8 ` `
More Algebra Questions
- 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.)
Direction: Solve the following expression and calculate the approximate value.
(5.78 + 3.12)² + 8.2² + 2 × 8.1 × (5.9 + 3.2)
...(44.11/4.01) + (11.99/3.03) + 23.9% of 49.978 = ?3.03
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exactvalue.)
181.87 ÷ 13.89 X 8.13 + ? = 11.852Â
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.)...
(14.98% of 319.99) - 7.998 = √?
√483.98 + 120.02 of 119.89 ÷ 59.87 of 29.87 = ?
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