(x - y + z) - (2x - 3y² - z) + (x² + y² + z²) me ayudan
sacky1290:
Solution: (i) (2x+3y)² = (2x)²+2(2x)(3y)+(3y)² = 4×2+12xy+9y2. (ii) 52²= (50+2)² ... Identity(ii):. (x-y+z)²= (x-y+z) (x-y+z) =x(x-y+z)-y(x-y+z)+z(x-y+z) = x²-xy+xz-yx+y²- yz+zx-zy+z² = x²+y²+z²-2xy-2yz+2zx.
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Solution: (i) (2x+3y)² = (2x)²+2(2x)(3y)+(3y)² = 4×2+12xy+9y2. (ii) 52²= (50+2)² ... Identity(ii):. (x-y+z)²= (x-y+z) (x-y+z) =x(x-y+z)-y(x-y+z)+z(x-y+z) = x²-xy+xz-yx+y²- yz+zx-zy+z² = x²+y²+z²-2xy-2yz+2zx.
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