book Maths Puzzle Numerical Ability

use the discriminant to find what type of solutions the equation has (two rational, two irrational, one rational, or two nonreal complex. Do not solve

4x^2 + 9 = 12x

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book Other Question

please help solve this
3x=wyz

solve for x, w, and y
please explain so i can try to do others without help, thank you very much a dentist invested a portion of $15,000 in a 7% annual simple interest account and the remainder in a 6.5% annual simple interest goverment bond. the two investments earn $1020 in interest annually. how much was invested in each account.