Factor as the product of two binomials x sqared - 10x +21

(x - 3)(x - 7)

Step-by-step explanation:

Please use the symbol " ^ " for exponentiation:  x^2 - 10x + 21.

Note that 3*7 = 21 and that 3+7 = 10.  These are the clues we need to factor x^2 - 10x + 21.  If we factor by grouping, we get:

x^2 - 10x + 21 = (x - 3)(x - 7).  Note how -3x and -7x add up to -10 x (as they should), and that -3 times -7 is +21 (as required).

part a: 1.08

part b: 27.59