Simplify (0.4a + 1.2b) (-2.1a+1.1b) and verify when a=20 , b=30
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Step-by-step explanation:
putting a= 20 and b= 30 in eq we get
(0.4×20+1.2×30 )(-2.1×20+1.1×30)
=(8+36)(-42+33)
(44)(-9)
=-396
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