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What can you add to get twenty-seven and multiply to get twenty-one?
Wiki User
∙ 10y ago
If the given information is the sum and the product of two numbers, then the numbers are not integers, because only 1*21 or 3*7 equals 21, and their sum is different from 27. So let's write the quadratic form of an equation given the sum and the product of roots, and solve it.
The sum = 27, the product = 21
x2 - (summ of the roots)x + (product of the roots) = 0
x2 - 27x + 21 = 0; a = 1, b = -27, and c = 21
x = [-b ± √(b2 - 4ac)]/(2a) the quadratic formula
x ={-(-27) ± √[(-27)2 - 4(1)(21)]/[2(1)] = [27 ± √(729 - 84)]/2 = (27 ± √645)]/2
Thus, the numbers are (27 - √645)]/2 and (27 + √645)]/2.
Wiki User
∙ 10y ago
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You need to add cells C3 and C7 and multiply C3 by C6. Based on the order of operations what would you do?
multiply first, and then add
Do you add or multiply for area?
You have to multiply to find area you have to add to find perimiter
Do you add or multiply on area?
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