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Stumped on PSAT math questions. Can anyone help?
My daughter's pretty good at math, but these two questions on her practice PSAT have stumped her. I'm way beyond stumped. Can anyone help... with a bit of explanation? TIA
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2x² + 7x - 15 = 0
If r and s are two solutions of the equation above and r>s, which of the following is the value of r - s ?
A) 15/2
B) 13/2
C) 11/2
D) 3/2
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And...
If x - 2 is a factor of x² - bx + b, where b is a constant, what is the value of b ?
__________________
Lee
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