IB Solve the following question 17 Decide which of the following are quad -ratic equations. (x-2)(x+3) = 0
Answers
Answer:
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Answer:
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When you're factoring. But in the chapter review and on the test, you don't know from which of your section a particular quadratic has been drawn. Which method should you use?
Step-by-step explanation:
Solve (x + 1)(x – 3) = 0.
To solve this quadratic equation, I could multiply out the expression on the left-hand side, simplify to find the coefficients, plug those coefficient values into the Quadratic Formula, and chug away to the answer.
But why on Earth would I? I mean, for heaven's sake, this is factorable, and they've already factored it and set it equal to zero for me. While the Quadratic Formula would definitely give me the correct answer, why bother with it?
Instead, I'll just immediately solve the two factors they've given me:
(x + 1)(x – 3) = 0
x + 1 = 0, x – 3 = 0
x = –1, x = 3
That was quick! And my answer is:
x = –1, 3मार्च में अप्रैल