Homework Help: Algebra

Posted by Cassie on Saturday, June 6, 2009 at 2:22pm.

Use the quadratic formula to solve the equation. Give exact answers.

2x^2 + 11x - 21 = 0

a) -3/2, 7
b) 3/2, -7
c) 3/2, 7
d) -3/2, -7

I could not get any of these answers.

Algebra - MathMate, Saturday, June 6, 2009 at 3:56pm
The answer is (b), x1=3/2, x2=-7
Check that you use the formula
x=(-b+/-sqrt(B²-4ac))/(2a)

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