(a) If A = 5x3 4x2+ 7x + 15 B = 3x3 x2+ 2x+ 10 C = 2x3 - Maths - Algebraic Expressions

Question

(a) If A = 5x 3− 4x
2+ 7x + 15
B = 3x 3 −x 2+
2x+ 10
C = 2x 3− 3x 2+
5x+ 5
Find A − B − C

(b) Ifx= −3,y= −2,z= 5 find
the value of (3x− 4y+ 2z)

Manbar Singh · Accepted Answer

aA=5x3-4x2+7x+15B=3x3-x2+2x+10C=2x3-3x2+5x+5Now, A-B-C=5x3-4x2+7x+15-3x3-x2+2x+10-2x3-3x2+5x+5=5x3-4x2+7x+15-3x3+x2-2x-10-2x3+3x2-5x-5=5x3-3x3-2x3-4x2+x2+3x2+7x-2x-5x+15-10-5=0x3+0x2+0x+0=0b3x-4y+2z=3×-3-4×-2+2×5    as, x=-3; y=-2; z=5=-9+8+10=9

(a) If A = 5x 3− 4x 2+ 7x + 15B = 3x 3 −x 2+ 2x+ 10C = 2x 3− 3x 2+ 5x+ 5Find A − B − C (b) Ifx= −3,y= −2,z= 5 find the value of (3x− 4y+ 2z)

(a) If A = 5x ³− 4x ²+ 7x + 15
B = 3x ³ −x ²+ 2x+ 10
C = 2x ³− 3x ²+ 5x+ 5
Find A − B − C

(b) Ifx= −3,y= −2,z= 5 find the value of (3x− 4y+ 2z)