Let the roots of the polynomial x^2 + 7x -2 be a and b. Evaluate a^2 + b^2

When you answer this can you explain

Hell . what are the solutions to `10x^2 - 38x - 8 = 0`? is this when i find the factors and use the numbers within the factors to determine the zeros? i hope that made sense lol

Vinny is interviewing for a job.he wants his take home pay to be at least $42,000.what is the least salary he can earn if he pays 25% income tax?