book Maths Puzzle Numerical Ability

Calculate the value of (b² - 4ac) in the equation "9x² + 12x + 16 = 0" and state how many real solutions this equation has. What are they?

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book Other Question

how do we solve the intersection pt (x,y) of d following equations/lines

20x + 20y >= 250
15x + 25y >= 375
18x + 12y >= 200

these three lines will intersect at a point, wha
The measure of the area of a rectangle is 6a^2+7a+2. The width is a binomial of the form ap+q. What is the measure of the perimeter of the rectangle?