book Maths Puzzle Numerical Ability

Hi all,

I am having a meltdown with Quadratic equations, vertexes and intercepts. Could someone please help me uunderstand this problem?

Use the discriminant to determine whe

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book Other Question

A specialty coffee store creates a special mix of two coffees at two different prices: $6.42 and $7.28 per pound each. How many pounds of the $7.28 coffee should be mixed with 7 pounds of $6.42 coffee to sell the mixture for $7.20 per pound? I need help with this problem. I know that I am suppose to multiple both sides with the square root.

Simplify square root of x+1 + 1 over the square root of x + 1