Question

3. If x=1, y = 2 and z = 5, find the value of:

(b) x² + y2 + z²
(d) xy + yz - zx
(e) 2x²y - 5 yz + xy²
(c) 2x² - 3y² +z²
(f) p⁴+q⁴‐r⁴​

Answer 1

Answer:

x² + y2 + z²

xy + yz - zx

2x²y - 5 yz + xy²

2x² - 3y² +z²

p⁴+q⁴‐r⁴

Answer 2

Answer:

b) 1²+ 2×2 + 5²

=1+4+25

= 30

d)1×2 + 2×5 - 5×1

=2+10-5

=12-5

=7

e)2×1²×2 - 5×5×2 + 1×2²

=2×2 - 25×2 + 4

=4 - 50 + 4

= 42

c)2×1² - 3×2² + 5²

=2 - 3×4 + 25

=2 - 12 + 25

=-10 + 25

=15

f) in this (f) is i think printing mistake because there is no given value of p and r

but in (b) (d) (e) (c) have given value

please mark me as brainlist