exam Maths Puzzle Numerical Ability

x>5+4 or 2x<9+3
x>9 2x<12
x<12/2
x<6

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exam Other Question

Determine whether the following equations have a solution or not? Justify your answer.
a) 5x2 + 8x + 7 = 0
b) (7)1/2y2 - 6y - 13(7)1/2 = 0
c) 2x2 + x - 1 = 0
d) 4/3x2 - 2x
I am having trouble obtain the correct answer for solving the following information:

F(x)= 2x^2 - 7x - 4

use the vertex and intercepts to sketch the graph of each quadratic f