Question

add the following please solve dis question

Answer 1

$(i) \: \: (5x + 4y - 7) + ( - 8x + 2y + 28) \\ \\ = 5x + 4y - 7 - 8x + 2y + 28 \\ \\ = 5x - 8x + 4y + 2y + 28 - 7 \\ \\ = - 3x + 6y + 21 \\ \\ \\ \\ (ii) \: (3x {}^{2} - 5y + 6) + (4x {}^{2} - 4y - 6) \\ \\ = 3x {}^{2} - 5y + 6 + 4x {}^{2} - 4y - 6 \\ \\ = 3x {}^{2} + 4x {}^{2} - 5y - 4y + 6 - 6 \\ \\ = 7x {}^{2} - 9y + 0 \\ \\= 7x {}^{2} - 9y$


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