If a + b = 15, and ab = 50. What is the value of ?
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good question
Greatt
Great question!
Thank for sharing!!!
Tricky wording but good practice
Thank you very much!
ok!
Wait can someone explain why we subtract 2ab? I got the right answer but just from guessing tbh
(a+b)^2 = a^2 + 2ab + b^2, so rearranging gives you a^2+b^2 = (a+b)^2 - 2ab. hope that helps!
What it tests
Your ability to manipulate linear and quadratic expressions, substitute unknowns, and solve equations under time pressure.
Common trap
Losing a sign when moving terms across the equals sign, or dividing both sides by a variable that could equal zero.