Bonsoir,
1)
9x² -30x +15 + 21x² -12x -35x +20
= 30x² -77x +35
2)
30x² -77x +35
= 30* (-2)² -77* -2 +35
= 30* 4 +154 +35
= 120+154+35
= 309
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Bonsoir,
1)
9x² -30x +15 + 21x² -12x -35x +20
= 30x² -77x +35
2)
30x² -77x +35
= 30* (-2)² -77* -2 +35
= 30* 4 +154 +35
= 120+154+35
= 309