exam
Maths Puzzle
Numerical Ability
subtract
2x/x^2 - 13x + 42 - 7/ x-6
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exam Other Question
What is the value of b if 2x^2 + bx + 8 has a discriminant of -15 ?
i said 7 but my teacher marked it wrong !!! I think I should have said -7 or +7 ,can someone please expain this to me ?
given: f(a)=(sqrt)a^2+3a, find a(-2)
a.-4 and 1
b. (sqrt)10
c.(sqrt)2
d. There is no real solution