1 ) a⁴+b⁴+2a²b², 2a⁴-7b⁴-4a²b², 2a⁴-3b⁴
2) -5/6a²b , -3/18a²b , 1/12a²b
3) 7a+ 5b-3c , 6a-2b +2c , 5a + 4b-4c
4) -x² - y²-z² , 2x² + 3y² + 4z² , -x² − z²
solve step wise useing horizontal method
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answer 4
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