Question

please solve the first one.
please quickly solve it​

Answer 1

Answer:

x²-y²-z²+2yz

Step-by-step explanation:

x²-(y²+z²-2yz)

x²-y²-z²+2yz

Answer 2

d) BADC

Explanation:

gvn.

$x {}^{2} - y {}^{2} - z {}^{2} + 2yz = 0$

$x {}^{2} - ( {y}^{2} + {z}^{2} - 2yz) = 0$

write this y2 + z2 - 2yz in terms of ( a - b )^2 formula

$x {}^{2} - (y {}^{} - {z}^{} )^2 = 0$

write this x^2 - (y - z)^2 in terms of ( a2 - b2 ) formula

$(x - y - z)(x + y - z) = 0$