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QuestionSolve by the formula method: 2x^2 + x - 300 = 0.
Community Answera = 2, b = 1, and c = -300. By the quadratic formula x = {-1 +/- √[1² - (4)(2)(-300)]} / (2)(2) = [-1 +/-√(1 + 2400)] / 4 = (-1 +/- √2401) / 4 = (-1 +/- 49) / 4 = 48/4 or -50/4 = 12 or -12½ = x. As odd as that second value seems, both of those x values do work in the original equation. -
QuestionWhat if my b is a negative?
I_l1ke_gam3sCommunity AnswerIf b is negative, in the quadratic formula it becomes -(-b), or +b, meaning you're working with a positive b. -
QuestionHow do you use completing a square?
Community Answer -
QuestionDo I have to leave it in the form of plus-minus, or can I make the plus equation separate from the minus one?
Community AnswerIt's your choice, but it's not mandatory to keep it in the plus-minus form. Most teachers and textbooks teach plus-minus, but that all depends on the material taught.
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QuestionWhat if b ITSELF is negative?
Community AnswerWhen an already negative number has another negative sign in front of it, the negative number becomes positive. -(-b) = +b. So in the quadratic formula, the -b in front becomes b.
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