book Maths Puzzle Numerical Ability

Could some one help me understand this problem?

The instructions are to solve the inequality. Find the vertex and intercepts, then graph it:
y = -x^2 - 3x - 2

Thanks very much

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book Other Question

Determine the roots of the following quadratic equation

x^2 - 14x + 45 = 0
Evaluate the expression: 3.2-3/5

I am lost with the "-" sign

Thanks for your help