Question

Give the values of a, b, and c needed to write the equation's standard form.(5 + x)(5 - x) = 7A = 1; B = 0; C = -18A = 25; B = 0; C = -1A = -1; B = 0; C = 25

Answer 1

We need to FOIL that out and then get it into standard form to see what our A, B, and C are.  FOILing gives us $25-x^2=7$.  If we move the 7 over by subtraction and set it equal to 0, we have $-x^2+18=y$.  In order to avoid a negative leading coefficient, we can change all the signs to get $x^2-0x-18=0$ so A = 1, B = 0, C = -18, first choice above.