exam Maths Puzzle Numerical Ability

Please help me in solving the quadratic equation x^2 - 7x + 12 = 0. Show all steps.

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exam Other Question

Alright I have this warmup, and i have NO clue whatsoever on how to do it,
The question says. "Graph the following system of equations and use the feasible region to minimize the Not understanding the polynomials, please help. What is the number of terms, the degree of the polynomial,the leading coefficient and is the ploynomial ascending or descending.
1-x^2+6xy^2-x^3y^3+12y^5