4. Simplify:
(a) (7x4 - 7x* + 7x + 2x) + (-5x* + 7x2 + 5x2 -9)
(b) (7x4 - 6X° + 9x² + 3x) + (-4x4 + 6x3 + 4x2 - 10)
(c) (8x - 4x + 9x - 4)-(-9x6 - 6x + 4x2 - 9)
(d) (9x? - 2x5 + 9x - 2) - (-2x - 7x5 + 8x2 - 3)
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Answer:
(a)249
(b)131
(c)7477
Step-by-step explanation:
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