7. Doğal sayılarda çarpma işleminin toplam işlemi üzerine dağılma özelliğinden faydala narak aşağıdaki eşitlik verilmiştir. 4x (5+ a) = bx2 + 28 Buna göre a + b= ? A) 13 B) 15 C) 17 D) 19
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