x3 + 13x2 + 42x = x(x + 6)(x + 7).
2 x 7 + 5 = 19
If I do your homework for you, you will fail your test.
5x2 + 3x + 8x2 = 13x2 + 3x = x(13x + 3)
572 Because 2x11=22 and 13x2=26 and 22x26=572.
x3 + 13x2 + 42x = x(x + 6)(x + 7).
It is: (x2 + 5x) (x + 8)
x(x + 8)(x + 5)
The final answer is 112.
13x2=26 By Someone?
2 x 7 + 5 = 19
4x4 + 13x2 + 36 is a quadratic in x2. The discriminant is 132 - 4*4*36 = -407. Since the discriminant is negative, the expression has no real roots and so it cannot be factorised (in the normal sense of the term).
I'm going to assume the polynomial in question is 2x7+(3-2x3)+(5x8-4x) Expanding out the polynomial: 2x7+3-2x3+5x8-4x Order the terms by powers of x: 5x8+2x7-2x3-4x+3 Since 8 is the highest power of x, the degree of the polynomial is 8.
If I do your homework for you, you will fail your test.
5x2 + 3x + 8x2 = 13x2 + 3x = x(13x + 3)
572 Because 2x11=22 and 13x2=26 and 22x26=572.
x3 + 13x2 + 42x = x(x2 + 13x + 42) = x(x2 + 6x + 7x + 42) = x[x(x + 6) + 7(x + 6)] = x(x + 7)(x + 6)