Thursday

December 18, 2014

December 18, 2014

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

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 3:56pmThe answer is (b), x1=3/2, x2=-7

Check that you use the formula

x=(-b+/-sqrt(B^{2}-4ac))/(2a)

**Answer this Question**

**Related Questions**

Algebra - Solve by using the quadratic formula. 3x^2=11x+4. Look up the formula ...

Algebra - Use the quadratic formula to solve the equation. Give exact answers: ...

8th Grade Algebra - You know how to solve quadratic equations using algebra, ...

algebra - Solve the quadratic equation: 2x(squared)+6x+12=0 I know you have to ...

algebra - use the quadratic formula to find the roots of the equation. round to ...

Math - Use the quadratic formula to solve the equation. x² - x = -2 Type an ...

Math - Use the quadratic formula to solve each of the following quadratic ...

QUADRATIC EQUATION - r^2+8r=48 First bring the 48 to the other side of the ...

algebra II - I'm quite clueless as to how to solve this. I know the quadratic ...

algebra - 1)Solve by factoring:5x^2=4-19x answer=-4,1/5 2)Which quadratic ...